/*
 Copyright (c) 2020 Xiamen Yaji Software Co., Ltd.

 https://www.cocos.com/

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated engine source code (the "Software"), a limited,
 worldwide, royalty-free, non-assignable, revocable and non-exclusive license
 to use Cocos Creator solely to develop games on your target platforms. You shall
 not use Cocos Creator software for developing other software or tools that's
 used for developing games. You are not granted to publish, distribute,
 sublicense, and/or sell copies of Cocos Creator.

 The software or tools in this License Agreement are licensed, not sold.
 Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */

import { DEV } from 'internal:constants';
import { errorID } from '../../platform/debug';

/**
 * @zh
 * 组合任意多个枚举。
 * 此函数的行为等价于返回了一个新的枚举，其成员囊括了所有源枚举的成员。
 * 这些枚举的成员必须各不相同（包括成员名和值），否则行为是未定义的。
 * @en
 * Combine arbitray number of enumerations.
 * It behaves like an enumeration having members that is a combination of members of the source enumerations
 * is returned.
 * These enumerations shall have non-overlaped member names or member values.
 * If not, the behavior is undefined.
 * @example
 * ```ts
 * enum Apple { apple = 'apple', }
 * enum Pen { pen = 'pen' }
 * // As if `enum ApplePen { apple = 'apple'; pen = 'pen'; }`
 * const ApplePen = extendsEnum(Apple, Pen);
 * ```
 */
export function extendsEnum (): {};

export function extendsEnum<E0> (e0: E0): E0;

export function extendsEnum<E0, E1> (e0: E0, e1: E1): E0 & E1;

export function extendsEnum<E0, E1, E2> (e0: E0, e1: E1, e2: E2): E0 & E1 & E2;

export function extendsEnum<E0, E1, E2, E3> (e0: E0, e1: E1, e2: E2, e3: E3): E0 & E1 & E2 & E3;

export function extendsEnum (...enums: any[]): any {
    if (DEV) {
        const kvs: PropertyKey[] = [];
        for (const e of enums) {
            for (const kv of Object.keys(e)) {
                if (kvs.indexOf(kv) >= 0) {
                    errorID(3659);
                } else {
                    kvs.push(kv);
                }
            }
        }
    }
    return Object.assign({}, ...enums);
}
